76
Fault code dis-
played
System characteristics
Cause
Measures
F9
Burner in a fault state
Fan speed too low during
burner start
Check the fan. Check the fan con-
necting cables. Check the fan pow-
er supply. Check the fan control.
Press reset button
R
.
FA
Burner in a fault state
Fan idle state not reached Check the fan. Check the fan con-
necting cables. Check the fan con-
trol.
Press reset button
R
.
FC
Burner in a fault state
Gas train faulty, modula-
tion valve control faulty or
flue gas path blocked
Check gas train. Check flue sys-
tem.
Press reset button
R
.
FD
Burner in a fault state and ad-
ditional fault b7 is displayed.
Coding card missing.
Insert coding card.
Press reset button
R
.
Replace control unit if fault per-
sists.
FD
Burner in a fault state
Burner control unit fault
Check ignition electrodes and con-
necting cables. Check whether a
strong interference (EMC) field ex-
ists near the appliance.
Press reset button
R
.
Replace control unit if fault per-
sists.
FE
Burner blocked or in a fault
state
Coding card or main PCB
faulty, or incorrect coding
card
Press reset button
R
. If fault per-
sists, check the coding card and
replace coding card or control unit
if necessary.
FF
Burner blocked or in a fault
state
Internal fault or reset but-
ton
R
blocked.
Restart the appliance. Replace the
control unit if the appliance will not
restart.
Troubleshooting
Fault codes
(cont.)
5792 925 GB
Diagnosis
Summary of Contents for Vitocrossal 100 CI1
Page 138: ...138 5792 925 GB ...
Page 139: ...139 5792 925 GB ...